Some serialization version stuff - minetest.git - modified minetest for gpcfs purposes

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author	Perttu Ahola <celeron55@gmail.com>	2012-03-25 18:45:27 +0300
committer	Perttu Ahola <celeron55@gmail.com>	2012-03-25 18:45:27 +0300
commit	f01c988094ee53920602a7a296264528095fc9bd (patch)
tree	2488969ce773328f55eb2a2c0df719e6bfa6e8be /src/mapsector.cpp
parent	677456d319f7935a308c28d22c57c4af91c3679a (diff)
download	minetest-f01c988094ee53920602a7a296264528095fc9bd.tar.gz minetest-f01c988094ee53920602a7a296264528095fc9bd.tar.bz2 minetest-f01c988094ee53920602a7a296264528095fc9bd.zip

Some serialization version stuff

Diffstat (limited to 'src/mapsector.cpp')

0 files changed, 0 insertions, 0 deletions

/* Copyright (C) 2015 Aaron Suen <warr1024@gmail.com> This program is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "imagefilters.h" #include "util/numeric.h" #include <cmath> /* Fill in RGB values for transparent pixels, to correct for odd colors * appearing at borders when blending. This is because many PNG optimizers * like to discard RGB values of transparent pixels, but when blending then * with non-transparent neighbors, their RGB values will shpw up nonetheless. * * This function modifies the original image in-place. * * Parameter "threshold" is the alpha level below which pixels are considered * transparent. Should be 127 for 3d where alpha is threshold, but 0 for * 2d where alpha is blended. */ void imageCleanTransparent(video::IImage *src, u32 threshold) { core::dimension2d<u32> dim = src->getDimension(); // Walk each pixel looking for fully transparent ones. // Note: loop y around x for better cache locality. for (u32 ctry = 0; ctry < dim.Height; ctry++) for (u32 ctrx = 0; ctrx < dim.Width; ctrx++) { // Ignore opaque pixels. irr::video::SColor c = src->getPixel(ctrx, ctry); if (c.getAlpha() > threshold) continue; // Sample size and total weighted r, g, b values. u32 ss = 0, sr = 0, sg = 0, sb = 0; // Walk each neighbor pixel (clipped to image bounds). for (u32 sy = (ctry < 1) ? 0 : (ctry - 1); sy <= (ctry + 1) && sy < dim.Height; sy++) for (u32 sx = (ctrx < 1) ? 0 : (ctrx - 1); sx <= (ctrx + 1) && sx < dim.Width; sx++) { // Ignore transparent pixels. irr::video::SColor d = src->getPixel(sx, sy); if (d.getAlpha() <= threshold) continue; // Add RGB values weighted by alpha. u32 a = d.getAlpha(); ss += a; sr += a * d.getRed(); sg += a * d.getGreen(); sb += a * d.getBlue(); } // If we found any neighbor RGB data, set pixel to average // weighted by alpha. if (ss > 0) { c.setRed(sr / ss); c.setGreen(sg / ss); c.setBlue(sb / ss); src->setPixel(ctrx, ctry, c); } } } /* Scale a region of an image into another image, using nearest-neighbor with * anti-aliasing; treat pixels as crisp rectangles, but blend them at boundaries * to prevent non-integer scaling ratio artifacts. Note that this may cause * some blending at the edges where pixels don't line up perfectly, but this * filter is designed to produce the most accurate results for both upscaling * and downscaling. */ void imageScaleNNAA(video::IImage *src, const core::rect<s32> &srcrect, video::IImage *dest) { double sx, sy, minsx, maxsx, minsy, maxsy, area, ra, ga, ba, aa, pw, ph, pa; u32 dy, dx; video::SColor pxl; // Cache rectsngle boundaries. double sox = srcrect.UpperLeftCorner.X * 1.0; double soy = srcrect.UpperLeftCorner.Y * 1.0; double sw = srcrect.getWidth() * 1.0; double sh = srcrect.getHeight() * 1.0; // Walk each destination image pixel. // Note: loop y around x for better cache locality. core::dimension2d<u32> dim = dest->getDimension(); for (dy = 0; dy < dim.Height; dy++) for (dx = 0; dx < dim.Width; dx++) { // Calculate floating-point source rectangle bounds. // Do some basic clipping, and for mirrored/flipped rects, // make sure min/max are in the right order. minsx = sox + (dx * sw / dim.Width); minsx = rangelim(minsx, 0, sw); maxsx = minsx + sw / dim.Width; maxsx = rangelim(maxsx, 0, sw); if (minsx > maxsx) SWAP(double, minsx, maxsx); minsy = soy + (dy * sh / dim.Height); minsy = rangelim(minsy, 0, sh); maxsy = minsy + sh / dim.Height; maxsy = rangelim(maxsy, 0, sh); if (minsy > maxsy) SWAP(double, minsy, maxsy); // Total area, and integral of r, g, b values over that area, // initialized to zero, to be summed up in next loops. area = 0; ra = 0; ga = 0; ba = 0; aa = 0; // Loop over the integral pixel positions described by those bounds. for (sy = floor(minsy); sy < maxsy; sy++) for (sx = floor(minsx); sx < maxsx; sx++) { // Calculate width, height, then area of dest pixel // that's covered by this source pixel. pw = 1; if (minsx > sx) pw += sx - minsx; if (maxsx < (sx + 1)) pw += maxsx - sx - 1; ph = 1; if (minsy > sy) ph += sy - minsy; if (maxsy < (sy + 1)) ph += maxsy - sy - 1; pa = pw * ph; // Get source pixel and add it to totals, weighted // by covered area and alpha. pxl = src->getPixel((u32)sx, (u32)sy); area += pa; ra += pa * pxl.getRed(); ga += pa * pxl.getGreen(); ba += pa * pxl.getBlue(); aa += pa * pxl.getAlpha(); } // Set the destination image pixel to the average color. if (area > 0) { pxl.setRed(ra / area + 0.5); pxl.setGreen(ga / area + 0.5); pxl.setBlue(ba / area + 0.5); pxl.setAlpha(aa / area + 0.5); } else { pxl.setRed(0); pxl.setGreen(0); pxl.setBlue(0); pxl.setAlpha(0); } dest->setPixel(dx, dy, pxl); } }


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